title: Light-spectrum modification of warm white-light-emitting diodes with 3D colloidal photonic crystals to approximate candlelight.
abstract: This study presents the light-spectrum modification of warm white-light-emitting diodes (w-WLEDs) with 3D colloidal photonic crystals (3D CPhCs) to approximate candlelight. The study measures the angular-resolved transmission properties of the w-WLEDs with CPhCs, which exhibit photonic stop bands based on the CPhC photonic band structures. The w-WLEDs with 3D CPhCs produce a low correlated color temperature of 1963 K, a high color-rendering index of 85, and a luminous flux of 22.8 lm (four times that of a candle). This study presents the successful development of a novel low-cost technique to produce candlelight w-WLEDs for use as an indoor light source.
authors.forename: Chun-Feng
authors.initials: CF
authors.lastname: Lai
authors.forename: Cheng-Liang
authors.initials: CL
authors.lastname: Hsieh
authors.forename: Chia-Jung
authors.initials: CJ
authors.lastname: Wu